// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_COMMON_ANDROID_ADDRESS_PARSER_INTERNAL_H_
#define CONTENT_COMMON_ANDROID_ADDRESS_PARSER_INTERNAL_H_

#include <stddef.h>

#include <vector>

#include "base/macros.h"
#include "base/strings/string_tokenizer.h"
#include "content/common/content_export.h"

namespace content {

namespace address_parser {

    // Internal classes and functions for address parsing.
    namespace internal {

        // Exposed for tests.
        struct CONTENT_EXPORT Word {
            base::string16::const_iterator begin;
            base::string16::const_iterator end;

            Word();
            Word(const base::string16::const_iterator& begin,
                const base::string16::const_iterator& end);
            Word(const Word& other);
        };

        // Exposed for tests.
        class CONTENT_EXPORT HouseNumberParser {
        public:
            HouseNumberParser();

            bool Parse(const base::string16::const_iterator& begin,
                const base::string16::const_iterator& end,
                Word* word);

        private:
            static inline bool IsPreDelimiter(base::char16 character);
            static inline bool IsPostDelimiter(base::char16 character);
            inline void RestartOnNextDelimiter();

            inline bool CheckFinished(Word* word) const;
            inline void AcceptChars(size_t num_chars);
            inline void SkipChars(size_t num_chars);
            inline void ResetState();

            // Iterators to the beginning, current position and ending of the string
            // being currently parsed.
            base::string16::const_iterator begin_;
            base::string16::const_iterator it_;
            base::string16::const_iterator end_;

            // Number of digits found in the current result candidate.
            size_t num_digits_;

            // Number of characters previous to the current iterator that belong
            // to the current result candidate.
            size_t result_chars_;

            DISALLOW_COPY_AND_ASSIGN(HouseNumberParser);
        };

        typedef std::vector<Word> WordList;
        typedef base::StringTokenizerT<base::string16, base::string16::const_iterator>
            String16Tokenizer;

        // These are exposed for tests.
        CONTENT_EXPORT bool FindStateStartingInWord(WordList* words,
            size_t state_first_word,
            size_t* state_last_word,
            String16Tokenizer* tokenizer,
            size_t* state_index);

        CONTENT_EXPORT bool IsValidLocationName(const Word& word);
        CONTENT_EXPORT bool IsZipValid(const Word& word, size_t state_index);
        CONTENT_EXPORT bool IsZipValidForState(const Word& word, size_t state_index);

    } // namespace internal

} // namespace address_parser

} // namespace content

#endif // CONTENT_COMMON_ANDROID_ADDRESS_PARSER_INTERNAL_H_
